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I’d like to show you tips
to be more efficient

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when you select an expression
to execute it.

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So, let’s imagine we have this
3-lines expression.

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If I want to execute the first 
line, what can I do?

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I can place the cursor at the 
beginning of the line

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and select the end,
or the end and select toward the beginning.

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So here it works.

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Now, what I can do: I can
double-click

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at the end of the line to select it.

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And even better : I can place
the cursor

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anywhere on the line and execute it.

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I press “Escape” to unselect.

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Now, if I want to select 2 lines,

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I will select normally, as I’ve
shown you before.

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So here I get 1000.

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And now, if I want to select 
the whole expression,

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what can I do?

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I can do the same thing than 
previously or I

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can place the cursor at the end 
of the expression,

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and double-click, or at the beginning
of the expression and double-click.